Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Physics > Forces > Flashcards

Forces Flashcards

(57 cards)

Start Studying
1
Q

What are two groups of forces?

A

contact and non contact forces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is a force?

A

A push or pull that acts on an object due to its interaction with another object.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is force measured in?

A

Newtons (n)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is the difference between a contact and non contact force?

A

contact force - the objects are physically touching .
non-contact force -does not require the objects to be touching.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are three examples of contact forces?

A

-friction
-air resistance
-tension

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are three examples of non-contact forces?

A

-gravitational force
-electrostatic force
-magnetic force.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is force classed as?

A

-vector quantity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is weight?

A

The force acting on an object due to gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Why is the force of gravity close to Earth?

A

It is due to the gravitational field around the Earth.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does the weight of an object depend on?

A

The gravitational field strength at the point where the object is.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the equation for the weight of an object? + state units

A

weight=mass x gravitational field strength
(W=mg)
w=newtons
mass=kilograms
gravitational field strength = n/kg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the three non-contact forces referred to as and why?

A

-‘fields of influence’
-they can act on anything in that surrounding area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is gravity?

A

-a force of attraction between any two objects that have mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

When would non-contact forces decrease?

A

-when the objects get further apart

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what are scalar quantities

A

-quantities that only have magnitude and no direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what is magnitude

A

size (measured with a number)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What are five examples of scalar quantities?

A

-Distance
-mass
-temperature
-time
-speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What are vector quantities?

A

-quantities that have both magnitude and direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what are five examples of vector quantites?

A

-acceleration
-displacement
-force
-momentum
-velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

How can a vector quantity be represented?

A

-arrow
-length of arrow represents magnitude
-direction of arrow is direction of the vector quantity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What are free body diagram?

A

-simple diagram that show all the forces acting on an object which are represented by ‘force arrows’.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

How to calculate resultant force - free body diagrams

A

-forces act in different directions
-some cancel each other out
-the force we have left is the resultant force ( overall force on object )

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

When is an object in equilibrium?

Study These Flashcards
A

-no resultant force acting on it

24
Q

What is the resultant force?

Study These Flashcards
A

-The overall force acting on an object taking into account all the different forces acting on it.

25
describe the relationship between a mass of an object and the weight of the object
-they are directly proportional
26
How can weight be measured?
-a calibrated spring balance
27
How do you use force vectors to find the resultant force?
-Arrange all of the force arrows tip to tail -the resultant force will be the single arrow that stretches from the start to the end.
28
what is a bearing
-an angle measured clockwise from the north direction
29
How many digits should you use when writing bearings?
-always use 3 digits e.g 067
30
What does the term 'deformation' mean?
-the change in the shape of an object as a result of the forces being applied to it.
31
What is elastic deformation?
- a change in the shape of an object which can be reversed once the forces causing it have been removed -so the object will return to its original shape
32
what is inelastic deformation
- a change in the shape of an object which can not be reversed once forces acting on the object are removed. -so the object will not remove to its original shape.
33
What is the minimum number of forces required to stretch , compress, or bend an object?
-two forced -if only one force is applied it will cause the object to accelerate instead.
34
what is an object's spring constant a measure of ?
-a measure of how many newtons of force it would require to stretch (or compress) the object by 1 metre.
35
what are the units of spring constant?
n/m
36
what does a higher spring constant mean?
-the spring is more firm so harder to stretch
37
what does a lower spring constant mean?
-The spring is less firm so easier to stretch
38
What is the definition of work done by a force?
-Work is done when a force causes an object to move through a distance. A force does work on an object when it causes a displacement of the object.
39
What is the equation to calculate work done?
-Work Done (W) = Force (F) × Distance (s) Where: W = Work in joules (J) F = Force in newtons (N) s = Distance in meters (m)
40
What is one joule of work?
-One joule of work is done when a force of one newton causes a displacement of one meter.
41
What happens when a force stretches or compresses a spring?
-does work and stores elastic potential energy in the spring. -work done is equal to the elastic potential energy stored, provided the spring does not exceed its limit of proportionality.
42
What is the equation for force applied to an elastic object like a spring?
-Force (F) = Spring constant (k) × Extension (e) Where: F = Force in newtons (N) k = Spring constant in newtons per meter (N/m) e = Extension in meters (m)
43
What is the moment of a force and how can it be calculated?
-The moment of a force is the turning effect of the force. It can be calculated by: Moment (M) = Force (F) × Distance (d) Where: M = Moment in newton-meters (Nm) F = Force in newtons (N) d = Perpendicular distance from the pivot to the line of action of the force (m)
44
How do you calculate pressure in fluids?
-Pressure (p) = Force (F) ÷ Area (A) Where: p = Pressure in pascals (Pa) F = Force in newtons (N) A = Area in square meters (m²)
45
How is the pressure due to a liquid column calculated?
-Pressure (p) = Height (h) × Density (ρ) × Gravitational field strength (g) Where: p = Pressure in pascals (Pa) h = Height of the column in meters (m) ρ = Density of the liquid in kg/m³ g = Gravitational field strength in N/kg
46
How does atmospheric pressure change with altitude?
-As altitude increases, atmospheric pressure decreases because there are fewer air molecules above the surface, and less weight of air is exerted.
47
What is the difference between distance and displacement?
-Distance is the total path length covered, regardless of direction (scalar quantity). Displacement is the straight-line distance from the start to the end point, with direction (vector quantity).
48
What is the equation for speed?
-Speed (v) = Distance (s) ÷ Time (t) Where: v = Speed in meters per second (m/s) s = Distance in meters (m) t = Time in seconds (s)
49
How do you calculate acceleration?
-Acceleration (a) = Change in velocity (∆v) ÷ Time taken (t) Where: a = Acceleration in m/s² ∆v = Change in velocity in m/s t = Time in seconds (s)
50
What does Newton’s First Law state?
-If the resultant force on an object is zero: An object at rest remains at rest. An object in motion continues at the same velocity (same speed and direction).
51
What is Newton’s Second Law of motion?
-The acceleration of an object is proportional to the resultant force acting on it and inversely proportional to its mass. Equation: Force (F) = Mass (m) × Acceleration (a)
52
What does Newton’s Third Law state?
-For every action, there is an equal and opposite reaction. This means when two objects interact, the forces they exert on each other are equal in size and opposite in direction.
53
How is momentum calculated?
-Momentum (p) = Mass (m) × Velocity (v) Where: p = Momentum in kg·m/s m = Mass in kilograms (kg) v = Velocity in meters per second (m/s)
54
What is the principle of conservation of momentum?
-In a closed system, the total momentum before an event is equal to the total momentum after the event, provided no external forces act.
55
What factors affect a vehicle’s stopping distance?
-Factors include speed, road conditions, vehicle condition, and driver condition.
56
How is braking distance affected by speed?
-The greater the speed, the greater the braking force needed, resulting in a longer stopping distance. High speeds also increase the risk of brake overheating and loss of control.
57
what is stopping distance?
- the sum of: -Thinking distance (distance traveled during the driver's reaction time) -Braking distance (distance traveled while braking)

Physics (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions